White hat ways to make money with Tumblr?

I know i'm posting in the Blackhat section, but since this is a question about Tumblr; i have no idea where else to post it.
If the admins know a better place, feel free to move it.

I have several Tumblr blogs.
1 of those blogs is getting pretty popular with almost 5k followers and growing faster every day.
My plan is to try to monetize it once it reaches 10k.
The big question is: How?

I know Tumblr can be highly strict when it comes to try and earn some money from your blog on which you've spend hours and hours.
But are there any white hat ways? Are there any ways with which Tumblr is okay with?

You could create a website, and throw the URL up every once in awhile. That way, you get traffic to your website -- and you can place any type of advertising. This also works with most (if not all) other social media websites.

Adsense or affiliate depends on the niche! Friend of mine had success with affiliate he was in sneakers he then converted his blog in porn and got banned. He threw a good 50$ week on autopilot and he still blames himself

Some good advice!
So, adsense is no problem on Tumblr?
I've heard stories about people putting too many ads on their blog and they got banned.
So what is too many ads?
Where does this grey zone begin and end?

Like i said: I put a lot of time in these blogs so getting banned because of a stupid mistake is not my plan.
Maybe the best option is to send a mail to tumblr HQ and ask them what my possibilities are?

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